I've made a page with pics of the ten main characters and their voice actors.
This show is just getting better. I'm not sure what it is -- the outlandish story, the good voice-acting, the erotic atmosphere -- but the show has exceeded my expectations. So I wanted to be clear who the voice actors were.
And there are some pretty interesting people involved. For instance, Tarlotte is played by Mochizuki Hisayo, the same VA who played Taruto in Magical Mew Mew Taruto (based on another manga by Kaishaku). Tanaka Atsuko, who plays Mika, was in Ghost in the Shell and Evangelion. Ogata Megumi, who plays Valticia, was Sailor Uranus, as well as (adult) UFO Princess Valkyrie (also a Kaishaku manga). And, of course, Kaon and Himiko are played by Kawasumi Ayako and Shitaya Noriko, who played Chikane and Himeko in Kannazuki no Miko. I've linked the names to pages with fuller info about each seiyuu and their roles.